Rotating mechanism for rock drills



March 2 1926.

E. G. GARTIN Rowvrme macxmmsm FOR aocx mums Filed Jan. 2. 1920 2 Sheets-Sheet l March 2,1926.

1,574,879 E. G. GARTIN ROTATING MECHANISM FOR ROCK DRILLS Filed Jan. 2, 1920 2 Sheets-Sheet 2 15 16' 1 +1 W J 16 m Patented Mar. 2, 119236.

UNITE A 1,574,879 PATENT orrics.

ELMER e. GARTIN, or cLA-RnMoNT, New HAMPSHIfR-E, nssrenonro SULLIVAN MA- CHINERY COMPANY, A CORPORATION or MASSACHUSETTS;

ROTATING MECHANISM FOR BLOCK DRILLS.

Application filed January 2, 1920. Serial No. 349,018;

To all whom it may concern.

Be it known that 1, Elaine G. GARTIN, a citizen of the United States, residing at Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements in R0- tating Mechanism for Rock Drills, of which the following is a full, clear, and exact specification.

1V y invention relates to rotating mechanism for rock drills.

It has for its object to provide an improved rotatingmechanism which is compact, enabling reduction in the length of the motor, and which is provided with manual control means for rendering it operative or inoperative at will. Another. object of my invention is to provide an improved rotating mechanism of the type wherein the ratchet portion thereof is in the opposite end of the tool from the drill steel and accordingly subjected to shock to a minimum degree. A further object of my invention is to provide an improved manual control mechanism of such form as automatically to permit slipping of the rotating mechanism in the event of sticking of the steel in a crack or for any other reason.

In the accompanying drawings I have shown, for purposes of illustration, one embodiment which myinvention may assume in practice.

In these drawings,---

Fig. 1 is a horizontal longitudinal section through the motor on the line 1-1 of Fig. 3, certain details being omitted and the manual control lever being in the opposite position.

Fig. 2 is a vertical longitudinal partial section through the motor on the line 22 of Fig; 3, certain parts being shown in elevation. 7

,Fig. 3 is an elevation of the rear end of the motor embodying my invention.

Fig. A is atransverse section on 4-4 of Fig. 2.

Fig. 5 is a transverse section on the line 5--5 of Fig. 2.

the fine Fig. 6 is. a; detail. perspective View of apart of my improved construction.

In this illustrative construction I have shownmy improved rotatingmechanis'ni em bodied in a" drill of a well known eqimfie dial-type. my invention relates. prim,

as t11 e-.1 stan'n mechanism paper, it W11]:

sufiice to state that the motor consists of a cylinder casing 1, having a bore 52 therein, and of a piston3 which is reciprocated in the cylinder under the action of pressure fluid distributed through any desired port arrangement, the cylinder being closed at its frontand back ends respectively by plates 4-. and 5. 7

A chuck housing 6, suitably formed to receive the tool chuck 7 and the mechanism for the immediate transmission of rotation to. the chuck is secured to the front head 1. The chuck 7 consists of a sleeve havinga, suitable tool receiving member 8' secured therein, and is provided at its rear end with an enlarged collar-lil'reer'tension 9 on which are formed a series of gear teeth 10.

To the back plate 5 is secured a second housing 11 which is provided with a throttle valve 12 controlling the supply of pressure fluid to suitable ports in the motor, with the connections 13 for the cleansing fluid supply, and with the mounting 1 1 for the manual feed controlling" handle 15, but as these do not per se relate to my invention, theirde tail construction is not disclosed. This housing 11 is also suitably cored out and machined to provide a spacefor the ratchet and pawl and other portions of my rotating mechanism to be later described. The front and back plates and the front and backhousings are held in assembled relation with the cylinder by means of suitable tie bolts 16 and nuts 17. v

Rotatahly mounted upon one of the tie bolts 16 is a sleeve 18 which has formed upon it at its front and rear ends pinions 19 and 20 adapted respectively to mesh with the gear teeth 10' formed upon the chuck sleeve and with a series of teeth, hereinafter described, forming a part of the rotating mechanism at the rear end of the cylinder. 7

The", mechanism which I have provided for the transformationof reciprocating motion of the piston to rotary motion for rotating the drill is of the typewhich provides a step by step rotation of the drill steel during the return stroke of the piston and is adapted to cause a stepLby stepr'fotatidn of the piston. A sleeve 21 is rotatably mounted in an" opening 22 in the" back plate This sleeve is" provided with an enlarged portion 23 Whiclihas formed upon itsperiphery a series of teeth adapted to mesh with the teeth of pinion 20 and te'rotate the slecvei s- The lit) sleeve 21. is also provided with a forward extension 2% projecting into the piston which is bored out as at 25 to receive the same. Screwed into the r ar. end of the piston and suitably secured is a bushing 26 which is formed with straight longitudinal grooves 2T to cooperate with a series of straight tongues 28 formed in the forwardly extending sleeve portion. The tops of the tongues 28 are dished to permit the flow of pressure fluid into and out of the bore 25 of the piston. The result of this construction is that the portion 23 of the sleeve is caused at all times to beara fixed relation to the piston and to rotate therewith. Suitably secured at the forward end of the bore 25 is a second bushing 31 having a rearwardly extending portion provided with a series of spiral grooves Rotatably mounted upon a hub member 38, secured centrally in the hollow of the rear housing memherll is a rifle bar 3- having spiral tongues 35 to engage the spiral grooves 32 formed in the bushing 31. At its rear end and the rifle bar is provided with an enlarged portion 36 forming a mounting for the pawls 37 (see Fig. 4). These pawls cooperate with ratchet teeth 38 formed in the inner surface of a sleeve mem ber 40 located between the portion 23 of the sleeve 21 and the pawl mounting 36. The sleeve member 40 is secured to and formed integral with an annular member 4L1 which is rotatably mounted in the extreme back end of the cored out portion of the housing 11. his annular member is provided with an annular under-cut groove 43 opening through its rear end, in which groove is located in freely slidable relationship the head 44 of a manual control member 45. This head is shaped to fit the groove loosely and re slidable there in, but to be prevented from rotation by the sides of the groove (see Fig. (i). This control member is formed with a threaded stem -16 which is freely slidable through the rear head of the housing member 11 and provided with a suitable nut 47 to-which is adjustably attached a manual control lever 1-8. By means of the threaded connection between the stem 46 and the nut 17, it is possible by movement of the control lever 8 to cause the head 4% to bind frictionally with the annular under-cut groove 4.3. l have shown the stem 46 and nut 47 provided with a right hand thread, but .it will be obvious that aleft hand thread could be used, the contr lling motions being reversed. The attachmentof lever -18 to nut 47 consists of a series of interlocking teeth sit), the parts being held in engagement by a nut 50. Should wear occur in the locking mechanism, all. that is necessary to take up the wear is to remove the nut 50 and change the position of lever 48, with respect to nut as areers-re e ise i ellers? leased position, i. e., in a position approximately ninety degrees from that shown in Fig. 3, the motor can operate and the piston reciprocate without causing rotation of the tool as the spiral toothed connection 32, between the vritle bar and the piston will cause the rifle bar to rotate the member 40 idly, the friction incident to this rotation being much less than the work necessary to the rotation of the tool. If it be desired to cause the tool to rotate, the lever 27 is turned in a clockwise direction causing the head 44- to press the member 41 tightly against the back end of the housing 11, the nut at? drawing the stem 46 rearwardly by this movement. This prevents rotation of the ratchet member and accordingly upon reciprocation of the piston, the spiral groove connection thereof with the rifle bar will cause an intermittent rotation of the piston, as the rifle bar will be free to turn upon the down stroke of the piston, but will be prevented by the pawls from turning upon a backward stroke. The rotation of the piston will be transn'iitted to the sleeve member 21 by the straight tongue and groove connection between the piston and the sleeve. The piston will accordingly impart its rotation to the sleeve 21 which will in turn by its toothed portion 23 cause rotation of the pinion 20, the sleeve 18, the pinion 19, and the drill chuck by means of the teeth 10. As long as the member etl is prevented from turning, it willbe obvious that a step by step rotation of the drill steel proportional in speed to the speed of the piston will result. All that is necessary to do to cause a cessation of the rotation is to release the frictional grip of the head 44. upon the member 4 1. A variable speed of drill steel rotation may be obtained by regulating the pressure applied to the friction member. I

Should the drill steel stick during rotating operation, there will not be a breakage of the parts of my rotating mechanism or a stripping of the gears as the frictional lock of the member 4L1 is such as to permit an extraordinary twisting torque to cause slipping of the parts before the breaking point of any of my elemnts is reached.

\Vhile I havein this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

hat I claim as new and desire to secure by Letters Patent is:

1. In a motor, a cylinder, a. hollow percussive piston therein, cooperating means carried by said cylinder and extendinginto said p ston for Tag 'otat'on 0f the lat ter, a chuck, and chuck rotating means including an element extending into the interior of said piston and having a straight tongue and groove connection therewith.

Ina motor. acylinder, ahollow percussive piston therein, cooperating means carried by said cylinder and extending into said piston for causing rotation of the latter, a chuck, and chuck rotating means in; cluding an element extending into the interior of said piston from the rearend thereof and having a straight tongue and groove connection therewith, a

3. A notor comprising a cylinder, a hollow rotating piston reciprocable therein, an intermittently rotating element having a portion extending into the interior of said piston, a chuck, and means for transmitting the rotative movement of the piston to said chuck to rotate the latter, including a power transmit-ting member surrounding said element.

4. A motor comprising a cylinder, a piston reciprocable in said cylinder, a member extending into one end of said cylinder and in said piston for causing intermittent rotation of the latter, a member extending into said cylinder and adapted to be rotated by said piston, a longitudinally disposed shaft rotated by said member, and a tool receiving means operated by said shaft.

5. A motor comprising a cylinder, a piston reciprocable in said cylinder, a member extending into one end of said cylinder for causing intermittent rotation of said piston, a member extending into said cylinder and adapted to be rotated by said piston, a longitudinally disposed shaft parallel with said cylinder rotated by said member, and a tool receiving means operated by said shaft.

6. In a motor, a cylinder, a hollow piston therein, cooperating means carried by said cylinder and piston for causing rotation of the latter, a chuck, means operated by the piston for rotating the chuck including an element mounted in the interior of said piston and having a straight tongue and groove connection therewith, and means for rendering said rotating means inoperative to rotate said piston.

7. In a motor, a cylinder, a hollow percussive piston therein, cooperating means carried by said cylinder and extending into said piston for causing rotation of the latter, a chuck, chuck rotating means including an element extending into the interior of said piston and having a straight tongue and groove connection therewith, and means to interrupt the operation of said chuck rotating means.

8. In combination with a tool, a percussive motor having a cylinder and a piston, a

member having a spiral tongue and groove connectionwith said. piston, a stationary member, rat het and r al onne tion batween said members, a member having a straight splined connection with said piston,

and means including power transmitting gearing to transmit rotation from said last mentioned memberto said tool.

9; Inooinbination w th a tool, a percussive motor having a cylinder and a hollow piston therein, a member projecting'into said hollow piston and having a spiral tongue and groove connection therewith, a

member adapted to cooperate therewith, a

ratchet and pawl connection between said members, means to'hol d or release said second mentioned member at will, a member having a straight splined connection with said piston, and means includingpower transmitting gearing to transmit rotation from said last mentioned member to said tool.

10. In combination with a tool, a percussive motor having a cylinder and a hollow piston reciprocating therein, a member projecting into said hollow piston and having a spiral tongue and groove connection therewith, a member normally held stationary, means to release said last mentioned member at will, a ratchet and pawl connection between said first and secondmentioned members, a member having a straight tongue and groove connection with said piston and pro jecting thereinto and surrounding said first mentioned member, and means to transmit rotation from said last mentioned member to said tool.

11. In a motor, a cylinder, a hollow percussive piston therein, cooperating means carried by said cylinder and extending into said piston for causing rotation of the latter, a chuck, chuck rotating means including an element extending into the exterior of said aiston and havin a strai ht ton 'ueand w h b t) groove connection therewith, and means to interrupt the operation of said chuck including manually adjustable friction means.

12. A motor comprising a cylinder, a piston reciprocable in said cylinder, a member extending into one end of said cylinder for causing intermittent rotation of said piston, a member extending into said cylinder and adapted to be rotated by said piston, a longitudinally disposed shaft parallel with the axis of said cylinder and rotated by said member, and a tool receiving means operated by said shaft.

13. In a motor, a cylinder, a hollow percussive piston therein, cooperating means carried by said cylinder and projecting into the interior of said piston'to impart to said piston alternate straight and spiral movements on alternate strokes, and tool rotating means including an element projecting into said piston, and power transmission gearing operated by said piston during its spiral movement.

it. In a motor, a cylinder, a hollow percussive piston therein, cooperating means carried by the cylinder and projecting into the interior of said piston to impart to said piston alternate straight and spiral movements on alternate strokes, and tool rotating means including a plurality of, elements projecting into said piston and power transmission gearing operated by said elements;

15. A motor comprising a cylinder, a piston reciprocable in said cylinder, a fluted member extending 'into one end of said cylinder for causing intermittent rotation of said piston, a fluted member extending into said cylinder and adapted to be rotated by said piston, a longitudinally disposed shaft parallel with said cylinder rotated by said member, and a tool receiving means operated by said shaft.

16. A motor comprising a cylinder and a rear head, a hollow rotating piston reciprocable in said cylinder and an intermittently rotating element having a portion eX- tending into the interior of said piston, 21 chuck, and means for transmitting the rotating movement of the piston to said chuck to rotate the latter including a power transmitting member surrounding said element and frictionally engaging said rear head.

In testimony whereof I aflix my signature.

. ELMER G. GARTIN.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,57 1,879, granted March 2, 1926, upon the application of Elmer G. Gartin, of Claremont, New Hampshire, for an improvement in Rotating;- Mechanism for Rock Drillsfeerrors appear in the printed specification requiring correction as follows: Page 2 line 2 strike out the Word and; page 3, line 105, claim 11, for the: Word exterior read interim"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of May, A. D. 1926.

[SEAL] WM. A. KINNAN,

Acting Commissioner of Patents, 

